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1. the loop chan nels can be selected see below For ADAT and USB the format can be selected see below TOSLINK the TOSLINK input is always routed to the digi loop output regardless of dac source 22 S PDIF the S PDIF input is always routed to the digi loop output regardless of dac source e AES1 the AEST input is always routed to the digi loop output regardless of dac source AES2 the AES2 input is always routed to the digi loop output regardless of dac source ADAT LOOP CHANNELS This parameter allows the user to select what ADAT channels are looped to the digi loop output Available options are ch 1 2 ch 3 4 ch 5 6 ch 7 8 and follow ADAT input The default is follow ADAT input ADAT USB LOOP FORMAT When the loop source is ADAT or USB the digital audio format on the digi loop output can be configured Available options are consumer and professional The default is professional B DIGITAL INPUT SETUP ADAT AES DUALWIRE This parameter controls the system configuration to use either the ADAT input or the AES DW input Available options are ADAT ACTIVE DEFAULT the adat input is configured and available as a digital input source AES DUALWIRE ACTIVE the aes dualwire input is configured and available as a digital input source In addition to the AES DUALWIRE configuration in SETUP hardware jumper J7 on the AT166 pcb must be placed in the correct position for proper operation The d
2. B POWER CONNECTIONS The m905 ACU has a built in universal power supply which accepts line voltages of 100 to 240VAC We include power cable specified for the country where it was ordered so it should be supplied correctly If not please contact your dealer or distributor for help For safety it is recommended that the AC power cable be connected to a grounded outlet B POWER UP SEQUENCE Before powering up your m905 make sure your monitor speakers or power amps connected to your monitors are turned OFF Once the m905 and the rest of your audio system are powered up turn on the power to your speakers When powering down we recommend that you first power off your speaker system and then power down the m905 B SYSTEM CONNECTIONS The m905 input output and interface connections are detailed here Pinout diagrams for various con nectors are located in the cable and connector wiring diagrams page 37 section of this manual UNBALANCED ANALOG INPUT This stereo input is for interfacing with consumer level 10dBv unbalanced analog sources Connections are made using standard RCA cables BALANCED ANALOG INPUT The balanced stereo analog input is via female XLR Connections are made us ing standard balanced XLR cables wired to the pin 1 shield pin 2 positive pin 3 negative CUE ANALOG INPUT The balanced stereo analog CUE input is via female XLR Connections are made using standard balanced XLR cables wired pin 1 shield pin 2 pos
3. Oo gt 06 BBl ecsog BG STE BS O O Oo 12 000000 diit O 5 458 o C fal 0 J8 m 0 0 ee OOo ea D00000 e A s0000 gj Now eX ex ye 00000000 gm ool psa El E R59 m 860 P aix 0000 E EI as 58 00000000 220 558 E 0000000 C79 C80 Dif 815 70101 F 586 lo co am dg BL 81 Bo Edu 00000000 Eem aero DOR MIT mo Ci Es Dis Cors Df 00000000 ices E oss S mao O 225 on Oo R54 5a ma S SEA mu Bor ol Sse VET erg Eg o DE 52 amp 10 0 E 0000 RR p Ex OD C7 C8 u5 T m 0535 0000 o Ril TPL fan OOOLlu gt Sodio a soo 55005000 rgia aLifnia atd ENDE m apa gt 2 c00 og roe au O Bicis C25 C29 js P2 X oo m
4. 2 Important Safety Information Indoor use only e Ordinary Protection This equipment should not be exposed to dripping or splashing Avoid placing objects filled with liquids such as vases or glasses on this equipment e Class Equipment grounded type Electrical rating 100 240V 50 60Hz 60W Mains supply voltage fluctuations are not to exceed 10 of the nominal supply voltage Pollution Degree 2 Installation Overvoltage Category Il for transient overvoltages Maximum Relative Humidity 8096 Operation temperature range 10 C to 40 C Storage and transportation temperature range 40 C to 70 C e Maximum altitude 3000m 9843 ft Equipment suitable for continuous operation e Weight ACU 7 8165 RCU 2 2165 Safety MarkingSymbols CAUTION READ ACCOMPANYING DOCUMENTS This symbol located on the equipment and in this manual refers to important instructions Read this manual thoroughly before operating this equipment WARNING ELECTRICAL SHOCK HAZARD This symbol located on the equipment and in this manual indicates the potential for electrical shock hazard The Grace Design m905 contains no user serviceable components Contact Grace Design for repair and upgrade information In the event that your Grace Design m905 needs to be returned to the factory contact us for a return authorization number Analog inputs unbalanced balanced CUE talkback mic Digital inputs 2x AES3 1 S PDIF
5. 1 TOSLINK ADAT selectable in 4 pairs or 2 pairs in S MUX USB AES3 Dual Wire mode AES and S PDIF connectors support DSD64 or DSD128 via DoP Version 1 1 e Audio circuitry designed for completely transparent and musical playback performance e Asynchronous Class 2 USB playback supports up 24bit 196kHz 05064 or DSD128 via DoP Version 1 1 configured for two channels down from computer and 10 channels up to computer Mastering quality DAC circuitry with configurable de emphasis filtering S ock dual stage Phase Lock Loop for ultra low jitter clock regeneration Hybrid RCU with hardware switches large level encoder and graphical LCD LCD display shows input level output SPL and DAC status plus a full calibration menu RCU includes built in microphone for talkback and onboard SPL meter SPL meter features include level peak fast and slow modes amp C weighting Precision 5 dB step level control for speakers and headphones volume displayed in absolute or custom reference level Reference headphone amplifier circuitry with outputs on both the RCU and ACU Dedicated mono dim mute and sub mute switches Mono mode can be set to L R summed L only in both channels R only in both channels L solo R solo L R and sub solo modes are available 3 available stereo speaker outputs with two assignable mono sub outputs or single stereo sub output e Multi mode SUB DAC METER out SUB out mode for stereo or mult
6. it is indicated in the top row of the DAC display Available setup parameters for each input Default values are in parenthesis UNBALANCED input name unbalanced level offset 008 BALANCED input name balanced level offset 008 CUE input name level offset OdB TOSLINK input name TOSLINK level offset 008 clocksource TOSLINK s lock enabled demphasis auto ADAT 1 8 input name ADAT level offset 098 clocksource s lock enabled demphasis off s mux off AES DW input name aes dw level offset OGB clocksource aes dw s lock enabled demphasis auto S PDIF input name S PDIF level offset 008 clocksource S PDIF s lock enabled demphasis auto AEST input name AES1 level offset 008 clocksource AES1 s lock enabled demphasis auto AES2 input name AES2 level offset 0dB clocksource AES2 s lock enabled demphasis auto USB input name USB level offset 008 clocksource internal s lock enabled demphasis off B SPEAKER SETUP Pressing any of the speaker buttons selects that output for the monitoring path exactly as it does in normal mode and brings up the setup information for that speaker output The following are the de tails of each of the speaker setup parameters 17 SPEAKER NAME This parameter allows the user to customize the displayed name for each speaker output For this parameter the control is a little diff
7. 10 from the ADAT input For stereo digital sources PCM sample rates up to 192kHz are supported as 05064 For the inputs the m905 will send 8 channels of audio at 44 1 48kHz 4 channels SMUX The second option limits the device to 2 input channels 2 playback channels This configuration sup ports playback of PCM sample rates up to 192kHz 05064 and DSD128 not currently available on Mac Input channels 1 2 are derived from the last selected digital input For Mac OSX the input stream format is selected in the Audio Midi setup window as shown eoo Audio Devices Built in Microphone 2 in 0 out 4 Grace Design m905 USB 2 0 Built in Input Clock source Grace Design m905 Inte 2 4 2 in 0 out Built in Output qug ow S 0 in 2 out 74 Grace Design m905 USB 2 0 10 in 2 out Source Default 9 Aggregate Device Format 44100 0 Hz 10ch 24bit Integer 12 in 2 out Ch Volume Value dB Mute Thru Master 1 SPDIF AES TOS Left 2 SPDIF AES TOS Right 3 ADAT 1 4 ADAT 2 5 ADAT 3 6 ADAT 4 7 ADAT 5 8 ADAT 6 9 ADAT 7 10 ADAT 8 v Built in Microphone 2in Oout Grace Design m905 USB 2 0 Built in Input Clock source Grace Design m905 Inte 2 inf 0 E Built in Output Output N 0 in 2 out 74 WESIGN USE 5 Source Default O Aggregate Device Format 44100 0 Hz 2ch 24bit Integer 4 in 2 out Ch Volume Value dB
8. OEM packaging Our packaging is designed with Korrvu suspension inserts which provide the best protection from the dubious underworld of freight handling so save your packaging material Inner boxes will contain all the items listed above If you think you are missing anything give your dealer or us a call and we ll get you taken care of right away B REGISTER YOUR UNIT Also we strongly urge you to fill out your warranty registration card We provide a 5 year transferable warranty on all of our products but without your registration it s hard for us to help you if and when help becomes necessary So please take a few minutes to complete and send in the enclosed card or simply fill out the warranty registration form on our website We always keep your information private Thank you Okay let s get started in making the necessary connections to get your m905 up and running First thing to do is mount the m905 in a rack If you re not rack mounting the unit you should attach the supplied rubber feet on each corner of the bottom cover so you won t scratch it or the surface you place it on If you are installing the ACU in a rack use the supplied rack screws and nylon washers which prevent the rack ears from getting marred The ACU will not run terribly hot so it can be mounted with other gear directly above or below However you should avoid mounting equipment that can radiate noise near the m905 ie power amp power conditioners etc
9. Press the knob again and the restore defaults se quence will execute If you do not wish to execute this instead rotate the knob counter clockwise back to no and press the knob to exit edit mode 23 B SPL METER SETUP The m905 provides a real time type IEC Type 2 SPL measurement display This setup mode allows the user to configure the different SPL meter parameters SPL meter setup parameters are as follows SPL METER This parameter is used to turn the SPL meter on and off The default is on When the SPL mea surement is on it is displayed in the normal and setup screens An off status is indicated on both screens as well FILTERTYPE The SPL measurement is calculated based on the desired filter type Available options are unweighted A weighted and C weighted The default is A weighted The selected filter is displayed on both the normal and setup screens For more information about SPL filtering see http en wikipedia org wiki A weighting PEAK MODE This controls the behavior of the SPL peak measurement Available options are decay 35 decay 5s decay 10s and hold The default is hold When decay is selected the peak will decay after the selected time When hold is selected the peak is held until the user clears it by pressing and holding the gt spl clear button RESPONSE The response controls the ballistics of the SPL meter Available options are slow and fast The default is fast When listening
10. button Once in any of the general setup modes pressing the MONO button again advances to the next general setup screen pressing repeatedly will scroll through all the different modes and wrap to the beginning once the last mode has been reached General setup parameters are as follows B DISPLAY SETUP This mode adjusts the RCU display settings The parameters are BACKLIGHT this parameter adjusts the display brightness Available range is 0 min to 9 max The default is max AUTO OFF TIME This controls the auto dim function of the display When the system does not have any user activity for the displayed amount of time the display automatically dims to the minimum brightness Any user activity turns the display back on to the chosen brightness above and the timeout restarts Avail able settings are 5 minute 15 minutes and 30 minutes The default is 30 minutes DIGI LOOP SETUP The m905 features an AES and S PDIF digital audio loop through output This allows a digital source to be looped through the m905 to another piece of equipment The m905 provides several routing op tions for routing and format conversion on the digital loop through output Digi loop setup parameters are as follows LOOP SOURCE This parameter selects the source for the AES and S PDIF loop through outputs Available options are Off digi loop is disabled follow dac input DEFAULT the dac input source feeds the digi loop output For
11. demphasis off adat s pdif figure setup screen selection gt Unless otherwise noted pressing the knob enters the parameter edit mode This is indicated by the parameter changing from black to red on the display Rotating the knob in edit mode modifies the se lected parameter Pressing the knob again exits edit mode and returns to the parameter selection menu The system remembers the last selected parameter in each setup mode and returns to that setting when each setup mode is entered 15 In the following sections each of the controls and features of the setup mode will be detailed All system setup parameters are stored in non volatile memory At any point the setup mode can be exited with the following actions TO EXIT AND SAVE CHANGES Press and release the setup button to save all setup parameters exit setup mode and return to normal operation TO EXIT WITHOUT SAVING CHANGES Press and hold the setup button to cancel all setup changes exit setup mode and return to normal opera tion B INPUT SETUP While in setup mode pressing any of the input buttons selects that input source for the monitoring path exactly as it does in normal mode and also brings up the setup information for that input source The following details each of the input source setup parameters INPUT NAME This parameter allows the user to customize the displayed name for each input source For this parameter the control is a little diffe
12. each digital input Available options are current input and wordclock When the clock source matches the input name the DAC is clocked off the recovered digital audio clock When wordclock is selected the DAC is clocked off the wordclock input The USB input provides the clocksource options of internal wordclock ADAT and TOS S PDIF AES The clocksource for the USB input from either of the TOS S DIF AES options will be the last of those three 16 previously selected So with the USB input selected select one of those 3 inputs TOS S DIF AES then return to the USB input to enter that input as the clocksource NOTE ON USB CLOCKING The USB controller in the m905 is configured for two channels of audio from the host computer and 10 channels to the host computer All channels in both directions must be at the same sample rate The sample rate is requested by the host computer but the m905 can be locked to one of the available clock sources listed above When the m905 is monitoring a USB source the internal Clock circuitry is used for the USB However when the m905 is monitoring a digital input other than the USB input the internal clock circuitry is switched to that input and the USB controller is kept alive with an auxilary clock This ensures that the computer continues to recognize the m905 as an audio device In this situation the USB clock and the s Lock clock will not be synchronous and the 10 channels going to the computer will not be s
13. latch talkback is toggled with each press of the switch The default is momentary 21 DIM ONTALKBACK This parameter controls how much the speaker sub output attenuates when talkback is active Available range is 30dB to OdB in O 5dB steps The default is 20dB Nifty fact The Talkback output connector on the m905 comes configured such that it outputs the talkback signal only when the talkback switch has been pressed By moving J3 and J4 on the main pcb inside the m905 the Talkback output connector can continously output the signal from the external Talkback microphone amplifier This allows the user to utilize the external microphone input amplifier as a high quality stand alone preamplifier To set the Talkback output mode Disconnect the m905 from its AC power by unplugging the AC power cable Use a 2 Phillips screwdriver to remove the top cover from the m905 There are 8 screws to re move on the top cover 4 on the top and 2 on each side Be careful to discharge any static electricity on the outside of the chassis before touching any of the jumpers inside the m905 Refer to Figure m905 Main PCB Jumper locations page 36 to locate J3 and J4 m MUTE SOLO There are no setup parameters associated with the mute solo control In setup mode the mute solo button functions exactly as it does in normal operation mode Other general setup options and information are accessed from the setup screen by pressing the MONO
14. load of 37 Ohms which will attenuate the signal to a point where the m905 may not lock REMOTE CONNECTOR The m905 RCU handles all system control Connection to the m905 RCU is via this DB15 connector which carries RS422 serial data DC power and headphone signals m905 ships with a high quality 25 cable While the serial data can travel over 1000 feet we do not recommend cables longer than 50 for headphone use Be sure to use the supplied DB15 cable If you need a longer cable contact your Grace Design dealer or us directly Do not use an off the shelf DB15 cable as the pinout will be incompatable TALKBACK SWITCH The talkback switch input allows the connection of an external switch such as a footswitch for remotely activating the talkback mic input or the built in talkback mic on the RCU The input is a TRS jack and is used with a normally open switching device Note that when using this jack the talkback function can be activated at both the RCU and the remote switch See the remote talkback cable diagram at the end of this manual for connection details m905 operation is categorized in two different modes normal operation mode and setup mode Once the RCU and ACU are connected and power is turned on the system boots up into normal operation mode In normal operation mode all of the ACU controls are active and the LCD display shows the main oper ating screen with input level SPL and DAC status Setup mode is entered by pus
15. that as your audio playback device and the system will work Different operating systems may pose their own set of complications in setting up the m905 as the audio playback device In the event that plug and play operation does not occur you will need to look at some specific setup variables for your OS In this case we will direct you to a very well written and comprehensive document by our friend and colleague Charlie Hanson from Ayre Acoustics http www ayre com usb htm This is an invaluable resource for computer USB audio setup information for most all current operat ing systems and we strongly urge you to familiarize yourself with the information pertaining to your specific OS Another excellent resource is Wavelength Audio s website http www USBdacs com In the event that you have any setup issues which aren t addressed by these resources feel from to contact us directly at 303 443 7454 Monday through Friday 9 5 MST B USING THE m905 FOR DAW PLAYBACK With the extremely high quality audio playback achieved with this USB interface the m905 can be great option as an stereo output device directly from your digital audio workstation For playback only this will work very well However using it in conjunction with other USB audio devices connected to your workstation computer s USB will require some adjustments to your computers audio settings and for best results some external clock routing between audio devices For Mac O
16. to be plugged in to the HOST computer and the type B connector to the m905 input PCM 44 1kHz 192kHz 24 bit and 050 64x 2 8224MHz via DoP V1 1 are supported Please refer to computer audio setup for further details about using this input SPEAKER OUT 1 2 3 Balanced stereo analog speaker outputs are provided via male XLR connectors which connect to your stereo monitor systems power amps or powered speakers Connections are made with standard balanced XLR cables These inputs are wired to the pin 1 shield pin 2 positive pin 3 negative Note See the unbalanced termination wiring diagram for connecting any of these outputs to unbalanced equipment p 37 CUE OUTPUT A balanced stereo CUE output is provided via male XLR connectors Normally this output is fed by the CUE input signal and would typically be wired to your studio s headphone cue system Connec tions are made with standard balanced XLR cables These inputs are wired pin 1 shield pin 2 positive pin 3 negative Note See the unbalanced termination wiring diagram for connecting these outputs to unbal anced equipment p 37 SUB DAC METER OUTPUT Meter OUTPUT Can be configured as either two mono balanced subwoofer outputs one stereo subwoofer output a stereo balanced fixed DAC output or a stereo balanced con figurable meter output These output options are configurable in the setup menu Subwoofer outputs settings are configured with each speaker output As a DAC ou
17. 20 10QHOM 49010 1no Sav Td 4907 S 1vav Aldds 899 Pe EE E EAE NUES 4 1 ONOW ans ova auimqvidessy 2 e l XNITSOL LNdLNO Ino H3laW ans ova zs JOHLNOO 13477 5 mia Hz IV3dS j zasn co E SLAdLNO SLANI TWLISIG GAONVIVENN i Q3ONV IVaNn i LNdNI L Q3ONV IV8 HOC i SYOLOATAS LNAdNI H3 Vv3dS LAdLNO Q39ONV IV8 3 Vv3ds 4 7 LOATAS YANVAdS TJOH INOO 13447 lOHINOO Lno 3NOHdQV3H 4 1 ONON gt 123188 3ounos APLANA lOHINOO I3 31 1 Q3ONV IV8 lt dIAV3Hd OIN MOVEM LAdLNO ONINWNS 8L 3n2 i4 Q3103NNOO 72096 10096 45 906W JlOHINOO T3 31 ANd MOVE VL LAdLNO LINO MOVSMTV L i SLNdLNO DOWNY MOVE ano NIVO MOVS V L SLNdNI DO TVNV dINV3Hd SIN MOVSX TV L NOY OIN LOATAS NIVO MOVE IYL nos LINN IOH LNOO 3103 35 17 PCB Jumper Locations REAR PANE
18. BFS OdBFS 20dBu 20 22kHz bandwidth Dynamic Range 20 22kHz bandwidth OdBFS 20dBu AES17 filter 20 22kHz bandwidth OdBFS 20dBu A weighted Input Lock Range AES3 SPDIF 44 1kHz 48kHz 88 2kHz 96kHz 176 4kHz 192kHz ADAT LIGHTPIPE 44 1kHz 48kHz 88 2kHz 96kHz ADAT LIGHTPIPE 44 1kHz 48kHz 88 2kHz 96kHz s Lock Capture Range 44 1kHz 48 kHz 88 2 kHz 96 kHz 176 4 kHz 192 kHz Word Clock Superclock Input Impedance switchable Minimum Voltage Maximum Voltage Word clock frequencies supported Superclock frequencies supported USB Supported Sample Rates POWER SUPPLY GENERAL Power consumption Input Voltage Dimensions Main chassis IEC 2U Remote control unit Weight Main chassis Remote control unit 76dBu to 24dBu in 0 5dB steps 0 0006 117dB 119dB 400Hz 700Hz 1200Hz 1300Hz 2000Hz 2000Hz 400Hz 700Hz 1200Hz 1300Hz 50Hz 70Hz 50Hz 70Hz 6Hz 7Hz 14Hz 20Hz 24Hz 30Hz 75 ohm 1Meg ohm 3V peakto peak 5V peakto peak 44 1 48 88 2 96 176 4 192kHz N A 44 1 48 88 2 96 176 4 192kHz DSD64 2 8224MHz DSD128 5 6448MHz 60W 100VAC 240VAC 50 60Hz 3 5 x 105 Xx 17 8 9 x 5 1 x 2 2 7 8lbs 2 2lbs 34 iagram 16 Block D NI ONASdOO 1 M2O I1OQHOM dOOT1 WLISId 1 sAldds 1no HonosHL x
19. CC ES LS OS 025 lt n 8 CH OU ONITOR CONTROLLER al Revision C RCU Firmware v1 12 XMOS Firmware v1 12 Welcome and thanks for purchasing the Grace Design m905 reference monitor controller We build all of our products to be completely reliable and straightforward to use so you can concentrate on doing great work While you will find the m905 is fairly straightforward to use it is a very powerful unit and a great deal of user configuration is possible so we recommend that you spend some time reading this manual to help avoid any common user difficulties In the event that you do encounter any technical difficulties with this or any of our products feel free to call us at 303 823 8100 Our office hours are 9 00 to 5 00 Monday through Friday MST or you may e mail any technical questions to info gracedesign com Also please check out our website for complete product information owner s manuals and technical documents http www gracedesign com Grace Design has been building audiophile quality products for the recording industry for over 20 years The technology in the m905 is the result of extensive research listening testing and careful refinement Your m905 represents a combination of absolutely pristine audio performance robust mechanical construction and complete reliability We sincerely hope it helps you achieve a new level of excellence in your work Contents WELCOME IMPORTANT SAFETY INFOR
20. E In no event will Grace Design be liable for lost profits or any other incidental consequential or Exemplary damages even if Grace Design is aware of the possibility of such damages In no event will Grace Designs liability exceed the purchase price of the product This warranty gives the customer specific legal rights The customer may also have other rights which vary from state to state Some states do not allow limitations on implied warranties or consequential damages so some of the limitations of the above may not apply to a particular customer 38 nual Rev REVISION PAGE CHANGE DATE added DSD references 3 26 2013 added reference level information added dual wire AES operation 2 1 sseseancuscuawosRmwaeRerlis ei cu netuded spy window showing 50 nputpreset ess 4534 added Dsor2erefeences __________________ ets 2527 added Sup channetinfornaton senes fes
21. ERROR TXT In this example a firmware file for the RCU was accidentally uploaded as indicated by the Incorrect file for this device error Disconnect the USB cable from the ACU and then cycle the power to the m905 B UPDATING XMOS FIRMWARE Copying 1 item 126 KB from debug C WorkSpace m905_A debug to m905 ACU K Discovered 1 item 126 KB details m905 ACU K Organize v Share with Burn New folder Name Date modified Type Size Favorites y BE Desktop SUCCESS TXT 8 17 2012 4 31 PM Document 1 KB EERE Os e gt Computer m905_ACU K 2 Organize Share with Burn New folder d v Gill e amp OSDisk C Date modified Type Size Recovery D 07 0 m905 ACU L ERROR TXT 8 17 2012 4 31 PM Text Document 1KB File Edit Format View Hep PROGRAM ERROR Incorrect file for this device TO UPDATE THE FIRMWARE ON THE M905 XMOS PERFORM THE FOLLOWING STEPS Download the m905 firmware package from the Grace Design Website and unzip it on your computer Turn off the m905 and connect your PC via USB to the USB 2 port on the m905 ACU Turn on the m905 Open the USB Audio Class Driver Control Panel which is located in the system tray of your PC USB Audio Class Driver Control Panel Customize 31 Select Firmware Upgr
22. G Headphones x feed 2 59 0 figure Level display WITH SPEAKER CONTROL ACTIVE e Clockwise rotation of knob increases volume in 0 5dB increments max level 100 in standard display mode and is user configurable in reference level display mode Counter clockwise rotation of knob Decreases the volume 0 5dB increments min level 0 Press hold knob Recalls global speaker output preset level configured in SETUP WITH HEADPHONE CONTROL ACTIVE Clockwise rotation of knob Increases volume in 0 5dB increments max level 100 Counter clockwise rotation of knob Decreases the volume in 0 5dB increments min level 0 Press 4 Hold knob If the headphone level is 0 0 press and hold will recall the headphone preset level configured in SETUP 11 If the headphone level is greater than 0 0 press and hold will mute the headphone output This state is indicated by the headphone mute icon on the display B SPEAKER OUTPUT SELECTION The speaker output selection is accomplished using the three illuminated speaker push button switch es The active speaker output is indicated by its switch illuminated green while inactive outputs are not illuminated The user defined name configured in SETUP is also visible on the display SPEAKER 1 Selects the speaker 1 output monitoring path selects the speaker 1 sub configured in SETUP and mutes speaker 2 and 3 SPEAKER 2 Selects the speaker 2 output monitor
23. L O 0 0 o on o TB IN L1 L2 01 16 BAL 1 R 16 BAL 1 L CUE R J8 CUE L Qn Oro rox UU ro 5 E gomman o 9 LI DIG OO vw g css g n e a ECCL C34 La C41 5 C53 c70 c79 c83 5 c90 10 c91 pry OOOO D 1 98 ue elu Os jc O 255 S cai c C U OOO OO oll Als UNBAL IN Q oe Al 0000 13 B OOOOO OOOOO 9 000 5 _ 000 5 000 SU 80 a Bases meno 00000 oocoo TE 0000000000 00000 gala 2 0O OG rii lo o 9 75 50 NECS UIS 5 roy 02 9 5 65 aoda 82 0 Eoo a IPI BIET lt ocido o ololole lo Oly 1010 snnt olo nne C127 55 RE 25 61010 Oye amp 100000 9101519 door 010 010 o C32 C47 c67 C81 NN 04 06 moa C37 C56 C76 C86 COD ac iu HP SOURCE SEL HP SOURCE
24. L This controls the fixed output level of the meter output when meter output mode and fixed meter level are selected above The setting is equivalent to the overall system gain Available range is 100dB to 418 5 in O 5dB steps The default is 100dB CUE OUTPUT SETUP The m905 features a dedicated cue output From the setup screen pressing the MON gt CUE button en ters cue setup mode Once this setup mode is active pressing the mon cue button functions exactly as it does in normal mode The cue output setup parameters are as follows OUTPUT LEVEL This controls the fixed output level of the cue output Available range is 0 120 in 0 5dB steps The default is 100 BALANCE The balance of the cue output can be adjusted The available balance range is 10dB to the left or right in 0 5dB steps When no balance adjustment is present on the cue output the parameter displays center The default is center DIM ON TALKBACK Both the internal m905 RCU talkback mic signal or the external talkback mic signal can be summed with the cue output When the talkback is active the source material can be attenuated to make the talkback easier to hear The available dim on talkback range is 35dB to OdB in 0 5dB steps The default is 20dB i HEADPHONE SETUP From the setup screen press and hold the knob to enter headphone setup mode Headphone setup parameters are as follows BALANCE The balance of the headphone output can be adjusted The ava
25. M Thru Master 1 SP 2 SP v 26 For PC the input stream format is selected in the USB Audio Driver Control panel as shown T USB Audio Class Driver Control Panel File Info Input Stream Format Output Stream Format 2 channels 24 bits Driver Info Input Stream Format Buffer Settings ma Device 0 Clock Source Str F ts EPEE 2 channels 24 bits Stream Formats Note If your application does not require more than 2 input channels the 2 input 2output setting is recom mended as it requires less over all bandwidth of the USB connection i COMPUTER AUDIO REQUIREMENTS Regardless of the type of computer you will use to playback audio from it must have at least one avail able USB port The m905 ships with a standard USB type A to type B cable The type A connector plugs in to the computer and the type B connector to the USB m905 input The m905 s asynchronous mode USB DAC supports standard driverless operation on Mac OSX since version 10 x x Sample rates up to 192kHz are supported For Windows PC computers users will need to download and install a free driver on their computer This driver can be found on our website http www gracedesign com support support Atm 27 On Mac computers driverless operation is supported by the OS The m905 will automatically show up in your computers list of supported audio devices as Grace Audio Device In most cases simply choose
26. MATION SAFETY MARKING SYMBOLS SERVICE INFORMATION M905 FEATURES 1905 Audio Control Unit Rear Panel 4 0 Audio Control Unit Front Panel m905 Graphical User Interface 6 UNPACKING AND INSTALLING Your m905 Box Will Contain Open and Inspect the Box Register Your Unit 7 CONNECTING THE M905 Power Connections Power Up Sequence System Connections 8 NORMAL OPERATION MODE Input Selection Volume Control Preset amp Headphone Mute Speaker Output Selection Monitoring Option Controls Display Save Recall of User Configuration 9 SETUP MODE Entering and Exiting Setup Mode Input Setup Speaker Setup Dim Setup GO oo oo OO NN N U COT Jug UJ GU CO O CO A N N U1 Ul 9 N A SUB DAC METER setup Headphone Setup Talkback Setup Mute solo 10 GENERAL SETUP Display Setup DIGI LOOP Setup Digital Input Setup System Setup SPL Meter Setup 11 ABOUT CROSS FEED 12 COMMUNICATION ERROR HANDLING 13 COMPUTER AUDIO SETUP Asynchronous USB Audio USB Up Channel Setup Computer Audio Requirements Using the m905 for DAW playback 14 UPDATING FIRMWARE Updating RCU Firmware Updating ACU Firmware Updating XMOS Firmware 15 SPECIFICATIONS 16 BLOCK DIAGRAM 17 JUMPER LOCATIONS 18 WIRING DIAGRAMS 19 CLEANING AND MAINTENANCE 20 WARRANTY INFORMATION 21 MANUAL REVISIONS 20 21 Es ee 22 ee 23 j 24 24 Ec E 26 E ca ca e 30 3 33 36 37 38 S8
27. N gt CUE SPL CLEAR button controls the MONITOR TO CUE and the SPL PEAK CLEAR features of the system Normally the CUE output is sourced via the CUE input Engaging gt routes selected control room monitor source to the CUE output When MON gt CUE is active this switch is lit solid green When mon cue is active this switch is lit solid green 13 The type 2 SPL meter in the m905 RCU can hold the peak SPL measurement level configured in SETUP The SPL CLEAR function resets the displayed peak level PRESS AND RELEASE BUTTON Toggles MON gt CUE on and off PRESS AND HOLD BUTTON Resets the SPL peak meter reading on the display TALKBACK The talkback button controls the summing of the talkback mic signal with the cue output The talkback system of the m905 has many options that are configured in setup One option changes the op eration of the talkback switch between a momentary and latching control In momentary operation the talkback will be engaged only as long as the talkback switch is pressed In latching control pressing and releasing the talkback switch toggles the talkback on and off so you can leave talkback engaged without holding the switch Another configuration option selects the talkback mic source as the RCU mic external mic or either When either the RCU or the external mic talkback are enabled the talkback switch is lit solid red While the RCU talkback mic is active the SPL meter is disabled This is
28. S X this is achieved by setting up the m905 in an aggregate audio device setup with the m905 as the output device For Win 98 Win 7 you must use asio4all drivers http www asio4all com There is currently no sup port yet for windows 8 With both of these setups if you are using multiple I O devices you will need to pay careful attention to clocking In Mac Core audio aggregate setups you are able to set which device is the clock master However this means that other devices will be sample rate converted which we do not recommend The m905 utilizes three different unique processors for system and digital audio control As indicated in the system SETUP menu the three processors remote control unit processor ACU audio control unit processor and XMOS digital audio control processor Over time firmware updates may become available These can be found and downloaded from the Grace Design website at http www gracedesign com support support htm Each processor firmware is independent of the other and may or may not be at the same revision level check the website for the latest revision information When ever firmware is updated on the system the user should confirm that all three firmware sets are the most current In the event that incompatible firmware revisions are accidentally loaded on the system the m905 RCU will display an error message instructing to update the system firmware The currently loaded f
29. SEL f C16 JP1 JP2 011 5 i 263 By x CR OUTPUTS 0 Sci ea NE ONTROL ROO DO eae 1000 2 284 2 E once am aot 9810 4 2 55 e gm uen 5255 R83 R45 Cer gO R77 gt O glo 82 50 mm U21 0000000 015 Rm RIGHT I loooooo 1510000 5 aa Eu SD D J2 o 0 1001219 R75 Rel aM 4 a 8 Bee Sx RBS sip O ol 5015 emo 15151 ra e o 515 of n SRE Ss m EE us ap eL naa ES ES Jes wan e nx 05 iEn U8 e S 020 Eg ET rj ip PT py E FT qn R12 RIS R26 R29 R41 R49 R54 R62 DAC SUB OUTPUTS CUE OUTPUTS JB6_up U13 us 869 Jom 0 D e 892 I op Cy Ey 0 C23 C29 C42 83 5 R68 m od a 9 8 O c m905 MAIN PCB JUMPER LOCATIONS P165 Rev B J7 AES DUAL WIRE ADAT SELECT C41 E pSr 5 1 41 80 oglnor sz me 048 R49R50 _ R56 Tii n2 Hi 0000 5 1001660902 m pl
30. ade from the menu Click the Browse button and locate the m905 5 file and select it e Click on Start Firmware Upgrade to begin the XMOS firmware upgrade process The progress of the upgrade will be indicated in a pop up dialog box DO NOT DISCONNECT THE DEVICE OR INTERRUPT POWER TO THE m905 WHILE THIS IS IN PROCESS Once completed power cycle the system Should the firmware upgrade fail start the XMOS firmware upgrade process over again Firmware Upgrade Device Grace Design m905 USB 2 0 VID 0x20B1 PID 0x0004 Firmware Image File GRACE t engineering products m905 firmware Browse Firmware Upgrade Lookin 905 166 revA a Date modified Type 2 4 2013 5 25 PM File folder i bin Recent Places 7777505 0x0016 bin 1 31 2013 11 20 AM File Desktop Libraries aA Computer File name m905_XMOS_DFU_0x0016 bin Files of type Fimware image bin Firmware Upgrade Device Grace Design m905 USB 2 0 VID 0x20B1 PID 0x0004 Firmware Image File Clock Sour Stream Formats GRACE t engineering products m905 firmware Start Firmware Upgrade Firmware Upgrade Firmware Upgrade Progress Upgrading Grace Design m905 USB 2 0 VID 0x20B1 PID 0x0004 Please do not disconnect the device while e upgrade is in progress Firmware
31. be in the folder This is your indication that the firm ware update process has completed successfully m905 RCU General options Import pictures and videos using Dropbox 12 Open folder to view files using Windows Explorer View more AutoPlay options in Control Panel Computer m905 Organize v Share with v Burn New folder Favorites Date modified Desktop Ej READY TXT m Downloads 1 Dropbox 12 Recent Places 8 Documents gt gt Computer gt m905_RCU K 6 29 2012 11 48 AM Organize Share with Burn New folder Favorites 3 Name Date modified Type Size BE Desktop READY TXT 6 29 2012 11 48 Text Documen t 1KB B Downloads 2 905 01 mot 12 12 2012 3 34 File 1 319 KB 1 Dropbox 2 Recent Places ES Documents from SRAM C WorkSpace m905_RC SRAM to m905 RCU K Discovered 1 item 1 28 MB 272 Computer m905 RCU earch m90 Organize v Share with Burn New folder MEL 3 Name Date modified Type Desktop 2 m905 RCU 01 mot 12 12 2012 3 343 File 1 319 KB m Downloads _ SUCCESS TXT 6 29 2012 11 48 AM Text Documen t 1 1 Dropbox Recent Places B Documents 29 Ifthe m905 encounters any Or
32. download succeeded Press Finish to dose this dialog 48128 bytes of 48128 bytes downloaded 32 ANALOG I O all specifications are subject to change THD N at Maximum Volume 1kHz 22Hz 22kHz BW 20dBu out lt 0 0008 10dBu out lt 0 0008 OdBu out lt 0 002 Intermodulation Distortion SMTPE DIN 4 1 50Hz 7kHz 20dBu out lt 0 002 OdBu out lt 0 0015 Frequency Response Balanced Inputs 3dB 3Hz to 1 25MHz Unbalanced Input 3dB 3Hz to 275kHz Dynamic Range 20 22kHz bandwidth 118dB 20 22kHz bandwidth and A weighting filter 121dB Output Noise 20 22kHz bandwidth at 20dB gain 99dBu 20 22kHz bandwidth and A weighting filter at 20dB Gain 102dBu Phase Deviation 20Hz to 20kHz 10 degrees 10Hz to 100kHz 19 degrees Crosstalk any channel 100Hz 104dB 1kHz lt 100dB 20kHz lt 79 Balanced Input CMRR 60Hz gt 70 1 2 gt 70dB 10kHz gt 70dB Gain Range 104dB to 13dB Channel Tracking Accuracy Any channel Maximum Output Level 26dBu Maximum Input Level Balanced inputs 25dBu Unbalanced inputs 21dBu Impedances Balanced inputs 88k Ohms Unbalanced inputs 53k Ohms Balanced outputs 300 Ohms Minimum load impedance 300 Ohms External Talkback Mic Preamp Gain 7dB to 70dB 1dB steps continued gt 33 DIGITAL TO ANALOG CONVERTER FIXED OUTPUTS all specifications are subject to change Output Levels User selectable OdBFS Fixed output trim range 0 5dB steps THD N 1kHz 1d
33. e Computer m905 RCU K Search m90 problems during the USB upgrade process the folder will contain a file Organize v Share with Burn New folder Date modified Type Size n al RRO Desktop ERROR TXT 6 29 2012 11 48 AM Text Document 1 Downloads 2 m905 ACU 01 mot 12 10 2012 4 56 File 127 KB 1 Dropbox 2 Recent Places Es Documents he type of problem encountered is reported on the Status line in ERROR TXT In this example a firmware Status Invalid Device sr 0x00000000 End Address 0x00000000 le for the ACU Was accidentally 4 uploaded as indicated by the Invalid Pads count 0x00000000 Device error Should an error occur restart the firmware upgrade process Disconnect the USB cable from the RCU and then cycle the power to the m905 UPDATING ACU FIRMWARE TO UPDATE THE FIRMWARE ON THE m905 ACU PERFORM THE FOLLOWING STEPS Download the m905 firmware package from the Grace Design Website and unzip it on your computer Turn off the m905 and connect your computer via USB to the USB upgrader port on the m905 ACU Turn on the m905 The m905 will enter USB upgrader mode instead of communicating with the m905 RCU the m905 RCU will display a communication error Once the m905 initializes it will appear on your computer as a mass storage cla
34. e cross feed circuitry in the m905 gives the brain some of the basic clues it needs and the result is a very pleasing simulation of an acoustic space We chose the parameters of the cross feed circuit to find a good compromise between accurate imaging and tonal neutrality For recreational listening there could be more aggressive modeling of the head related transfer function HRTF but this is usually at the expense of adding tone color For critical monitoring during the recording editing mixing process the user will find that the m905 cross feed circuit provides a sonically neutral character Below is a frequency response plot showing the response of the m905 cross feed circuit In this graph one channel of the headphone amplifier is driven The two traces show the direct channel and the op posite cross feed channel 24 10 irect Signal sfeed signal dB 25 20 50 100 200 500 1k 2k 5k 10k 20k 50k lt figure cross feed response graph gt unication Error Han If at any point communication is lost between the RCU and ACU the remote will display the communi cation error message and begin attempting to re establish communication During this time the ACU remains in the last configured state Once communication is restored the remote retrieves the system status from t
35. e monitoring and DAC path Once selected pressing the ADAT input button again increments sequentially through the channel pairs 1 2 3 4 5 6 7 8 for regular ADAT and 1 2 3 4 for S MUX ADAT When AES Dual Wire mode is active configured in SETUP selects the AES Dual Wire input for monitoring and DAC path Note that AES Dual Wire mode requires moving a jumper on the m905 digital PCBA inside the unit See AES DW Setup in sec tion 9 of this manual for details S PDIF Selects the S PDIF digital input for the monitoring and DAC path AES1 AES2 Selects the 51 or AES2 digital input for the monitoring and DAC path Once selected pressing the AES input button again toggles the AEST or AES2 selection The system remembers the last AES input that was selected as indicated by the input icon display USB Selects the USB digital input for the monitoring and DAC path B VOLUME CONTROL PRESET amp HEADPHONE MUTE The m905 utilizes a single rotary pushbutton encoder for control of the speaker and headphone volume levels level preset recall and headphone mute Switching between speaker level and headphone level control is done by pushing and releasing the volume control knob The current volume levels are indicated on the display with the active control being green and the inactive control in light gray The volume control is speed sensitive so the turning the knob at a higher velocity results in faster volume changes Genelecs sub
36. efault position selects the ADAT input These jumpers are shown the m905 DIGITAL I O PCB Jumper Locations diagram page 36 To set the ADAT AES Dual Wire mode Disconnect the m905 from its AC power by unplugging the AC power cable Use a 2 Phillips screwdriver to remove the top cover from the m905 There 8 screws to remove on the top cover 4 on the top and 2 on each side Be careful to discharge any static electricity on the outside of the chassis before touching any of the jump ers inside the m905 Refer to m905 DIGITAL PCB Jumper Locations diagram page 36 B SYSTEM SETUP RCU FIRMWARE VER This is a read only parameter that indicates the current firmware revision of the m905 RCU Attempts to edit this parameter will be ignored ACU FIRMWARE VER This is a read only parameter that indicates the current firmware revision of the m905 ACU Attempts to edit this parameter will be ignored XMOS FIRMWARE VER This is a read only parameter that indicates the current firmware revision of the m905 XMOS processor Attempts to edit this parameter will be ignored RESTORE DEFAULTS This menu item is used to restore the system to factory defaults Executing the follow ing sequence will erase all user defined setup data and return values to their default states Once restore defaults is the selected parameter press the knob The parameter no will turn red Rotate the knob clockwise to change the value to yes
37. erent but again you will remember how to do this from get ting the high score on Asteroids Or Centipede Pressing the encoder once brings up the character cursor From here rotate the knob to position the cur sor under the character you wish to edit Press the encoder again to enter edit Rotate the knob until the desired character is displayed Press the encoder again to enter the desired character and get back to the cursor Once all of the desired changes are complete move the cursor back to the and press the encoder to initiate the name change If the setup mode is changed or exited prior to selecting the lt any modifications to the name will be ignored LEVEL OFFSET The volume level of each speaker system can be matched by adjusting the level offset on each speaker output When a speaker output is selected this offset is added to the speaker and sub if applicable output levels The level offset range is 20dB in O 5dB steps BALANCE The balance of each speaker output can be independently adjusted The available balance range is 1OdB to the left or right in 0 5dB steps When no balance adjustment is present on the speaker output the parameter displays center SUB OUTPUT The sub output can be configured for each speaker output Available options are disabled L R Stereo L R Mono Mono gt L Mono gt R NOTE For the sub output to be active the SUB DAC METER output must be configured
38. evel global 0 0 SPEAKER speaker name speaker 3 level offset 0dB balance center sub output L R Stereo sub offset OdB preset level global 0 0 display mode global standard level reference level global 0 0 DIM SETUP From the setup screen pressing the dim button enters dim setup mode Once dim setup mode is active pressing the dim button will toggle the dim setting exactly as it does in normal mode The dim attenu ation level controls how much the speaker sub outputs attenuate when dim is active The available dim range is 35dB to 5dB in 0 5dB steps The default is 20dB B SUB DAC METER SETUP The m905 features a multi funciton SUB DAC METER output From the setup screen pressing the sub mute button enters SUB DAC METER setup mode Once this setup mode is active pressing or holding the sub mute sub solo button functions exactly as it does in normal mode The SUB DAC METER setup parameters are as follows OUTPUT MODE This parameter configures the SUB DAC METER output function Available options are sub output dac output and meter output The default is sub output When sub output is selected this output acts as the dedicated subwoofer output and is configured based on the speaker sub output settings in the speaker setup When DAC output is selected this output acts as a dedicated digital to analog converter output The last selected digital source is continuously output at a fixed DAC le
39. for sub output mode see SUB DAC METER setup section below The function of each of these settings is as follows disabled the sub output is turned off when this spearker system is selected L R Stereo the sub output is on for this speaker system and functions as a stereo output L R Mono the sub output is on for this speaker system and is summed mono on both output connec tors Mono gt L the left sub output is on for this speaker system and is the mono signal Mono gt R the right sub output is on for this speaker system and is the mono signal SUB OFFSET The sub output can have a programmed level offset to match each speaker system When a speaker output is selected this offset is added to the sub output level when the sub output is enabled The sub offset range is 20dB in O 5dB steps PRESET LEVEL GLOBAL This parameter sets the speaker output preset level This parameter is the same for all speaker outputs Available range corresponds to the standard level display and is 0 100 in 0 5dB steps DISPLAY MODE GLOBAL This parameter sets the speaker output display mode When standard level is selected the speaker level is displayed as a 0 100 range in O 5dB steps When reference level is selected the speaker level is displayed as 100dB range in O 5dB steps based on the ref level setting see below This parameter is the same for all speaker outputs REFERENCE LEVEL GLOBAL This parameter
40. he ACU and normal operation resumes B ASYNCHRONOUS USB AUDIO The asynchronous mode USB controller in the m905 represents significant improvement over any previ ous type of USB DAC Previously a USB DAC worked under standard adaptive mode USB audio which means the DAC s clock would have to sync to the non audio related computer USB buss master clock As you can imagine the computer has a lot else to do so the incoming clock signal to which the DAC s clock would have to sync was not ideal and would result in unwanted jitter With asynchronous mode USB the m905 s USB DAC becomes the master to which the computer s USB buss gets synced So the computer is now synced to a crystal based audio clock signal and the system 25 works with dramatically lower jitter No phase lock loop or sample rate conversion is necessary which means bit perfect playback from a computer with zero interface induced jitter B USB UP CHANNEL SETUP In addition to playback the m905 s USB interface allows for up to 10 channels to be transmitted back to the computer These up channels allow the user to use the m905 as a simple I O computer interface Up channel operation is configured in the PC s USB Audio Driver Control Panel or Apple OSX Audio MIDI Setup Two modes are available The first option configures the device for 10 input channels and 2 output playback channels Input channels 1 2 are derived from the last selected digital input and input channels 3
41. hing the setup button which switches the LCD display to the setup menu Upon entering setup mode current monitoring function is preserved but the display and controls will be dedicated to setup menu navigation and input The m905 is a closed loop control system to ensure that the status reported on the RCU matches the ac tual hardware setting in the ACU Any changes made to the configuration of the system are transmitted to the ACU where they are processed and reported back to the RCU for confirmation In the following sections all of the controls and features of the normal operation mode are detailed B INPUT SELECTION The RCU features 8 dedicated input select buttons in 2 rows of 4 above and below the LCD display Pressing any of these buttons will select the associated input source and connect it to the main monitor path The currently selected input source is indicated by the blue input icon on the LCD while inactive 10 inputs are indicated by the gray input icons NOTE The displayed name is user configurable in setup mode The names used here are the defaults UNBALANCED Selects the unbalanced analog input for the monitoring path BALANCED Selects the balanced analog input for the monitoring path CUE Selects the balanced cue analog input for the monitoring path TOSLINK Selects the TOSLINK digital input for the monitoring and DAC path ADAT AES DW When ADAT mode is active Selects the ADAT digital input for th
42. ilable balance range is 10dB to the left or right in 0 5dB steps When no balance adjustment is present on the headphone output the parameter displays center The default is center GAIN This parameter sets the gain of the headphone output The available settings are OdB 10dB and 20dB The default is OdB PRESET LEVEL This parameter sets the headphone output preset level Available range is 0 100 in 0 5dB steps The default is 0 0 EXCLUSIVE OUTPUT MODE The exclusive output mode allows the user to easily switch between speaker and headphone monitoring without having to mute the unused output When the exclusive output mode is enabled the output speaker or headphones that is in green on the normal mode display is active and the other output is muted Pressing the knob toggles the active muted output Available op tions for exclusive output are disabled and enabled The default is disabled MONO CONTROL When mono is turned on all monitor paths sum the left and right channels to mono There may be a case where the user wishes to keep the headphone signal stereo even when mono is en gaged for the main speaker systems Available options are to disable the mono control headphones stay 20 stereo even when mono is turned on and enabled headphones sum to mono when mono is turned on The default is mono control enabled HEADPHONE SOURCE SELECT From the factory the headphone output is configured to follow the input monit
43. indicated on the SPL meter display B DISPLAY DAC STATUS In addition to displaying the monitoring features detailed above the m905 RCU display also provides the current DAC status and a real time SPL readout usb 8 dac aes rate 48 0kHz sock internal locked n a clk aes locked bits pro lt figure DAC status gt THE DAC STATUS PROVIDES THE FOLLOWING INFORMATION e Selected digital input source demphasis if enabled s mux if enabled Sample rate PCM DSD s lock status if active Selected clocksource selected clocksource lock status If the system is unable to lock to the selected clocksource other than the recovered clock the dac will be clocked of the recovered clock and selected clocksource will flash red Bitstream status pro cons for TOSLINK S PDIF and AES s mux for ADAT and demphasis for TOSLINK S PDIF and AES SPL MEASUREMENT Using the internal m905 RCU microphone the m905 computes the real time sound pressure level based on the system configuration The current and peak SPL levels are displayed along with the filter mode in this section of the display The SPL measurement settings are configured in setup spl dBA L7 G peak 90 2 B figure SPL meter 14 B SAVE RECALL OF USER CONFIGURATION After a 10 minute period of inactivity the m905 saves the current user configuration to non volatile memory Upon power up the m905 reca
44. ing path selects the speaker 2 sub configured in SETUP and mutes speaker 1 and 3 SPEAKER 3 Selects the speaker 3 output monitoring path selects the speaker 3 sub configured in SETUP and mutes speaker 1 and 2 MONITORING OPTION CONTROLS MUTE SOLO The multi function MUTE solo button controls speaker MUTE and monitor path SOLO features Speaker MUTE mutes the signal going to the selected speaker and sub if assigned output s When the speaker MUTE is active the switch is lit solid red and the speaker MUTE icon is shown on the speaker status display SOLO mode provides a means to monitor left or right channel program material exclusively When SOLO mode is active the button flashes red The active SOLO channel is indicated on the speaker and head phone status display In left channel SOLO mode the right channel is muted in the speaker and head phone outputs In right channel SOLO mode the left channel is muted in the speaker and headphone outputs NOTE Enabling MONO during SOLO mode routes the active solo channel to both left and right outputs The operation of the sub output in SOLO mode depends on the selected sub configuration In L R stereo sub mode the left and right solo feature is available and follows the speaker headphone solo For any other sub configuration the sub output mutes when SOLO is active PRESS AND RELEASE BUTTON Toggles the speaker output mute on and off if solo mode is off Di
45. iple mono subwoofer outputs DAC out mode for a fixed DAC output fed by the selected digital input METER out mode fed by selected input signal digital or analog configurable with a fixed level or to fol low the monitor level Detachable RCU tilt base M905 AUDIO CONTROL UNIT REAR PANEL 1 2 34 5 a DER DES fa h f IM WY 100 240 50 GOHz 60 Watts GRACE DESIGN LYONS CO USA UPGRADE lt gt REMOTE TALKBACK SWITCH SPEAKER 14 15 16 17 1 ACmains input universal 100 240 VAC 50 60Hz 60 Watts max This connects m905 with the supplied AC power cable to AC power source 2 WordClock termination switch used to properly ter minate a connection from an external clock reference source to the m905 Word Clock input 3 Word Clock input for incoming word clock signals from a master clock or other equipment passing a master clock signal 4 WordClock output for sending or passing word clock signals from the m905 to other equipment 5 Two AES3 input XLR connectors used to receive stereo AES3 Dual Wire AES3 and DSD64 or DSD128 via DoP V1 1 6 S PDIF INPUT RCA jack input accepts a S PDIF format digital stereo signal DSD64 DSD128 via DoP V1 1 7 TOSLINK INPUT Optical connector accepts a TOSLINK format digital stereo signal 8 ADAT INPUT LIGHTPIPE connector provides a 2 chan nel input selectable in 4 pairs or 2 pai
46. irmware revisions will be displayed on this message screen for reference Important note Our bootloader is currently NOT compatatble with Mac OSX computers So the upgrade process can only be done using a Windows computer 28 UPDATING FIRMWARE TO UPDATE THE FIRMWARE ON THE m905 RCU PERFORM THE FOLLOWING STEPS Download the m905 firmware package from the Grace Design website and unzip it on your com puter Turn off the m905 and connect your computer via USB to the USB upgrader port on the m905 RCU Turn on the m905 The setup button will illuminate solid white on the remote control to indicate USB upgrader mode is active Note that the LCD display will be dark Once the m905 initializes it will ap pear on your computer as a mass storage class device with the name 905 RCU Open the folder It will contain a single file named READY TXT This indicates that m905 RCU is now ready for the firmware update Sim ply locate the firmware file that was downloaded filename starts with m905 RCU drag and drop the file to the folder containing READYTXT Once the file appears in the folder it has been copied and the m905 RCU begins updating its flash memory DO NOT DISCONNECT THE DEVICE OR INTERRUPT POWER TO THE m905 WHILE THIS IS IN PROCESS Once the reprogramming is com plete the m905 RCU will disconnect reconnect itself from the computer Open the folder again A file named SUCCESS TXT should
47. itive pin 3 negative TALKBACK MIC INPUT A standard microphone input which can be used with dynamic or condenser mi crophones Phantom power 4 48V is available see Setup Mode Wired pin 1 shield pin 2 positive pin negative AES3 DIGITAL INPUTS 1 amp 2 Two stereo AES3 inputs are provided via female XLR connectors Each of these conforms to the AES3 standard In AES Dual Wire mode the 51 input is used for the left channel and the AES2 input is used for the right channel Note that AES Dual Wire mode requires moving a jumper on the m905 digital PCBA inside the unit See AES DW Setup in section 9 of this manual for details Use of a high quality 110 Ohm balanced cable is recommended S PDIF COAXIAL INPUT Standard coaxial stereo digital input The input impedance is 75 Ohms Use ofa high quality 75 Ohm cable is recommended TOSLINK INPUT Standard stereo optical input connector for use with consumer devices Use a standard TOSLINK optical cable for connections to this input ADAT INPUT This input accepts a standard 8 channel ADAT optical input 44 1kHz 192kHz sample rates are supported S MUX for 96kHz 192kHz The user can select any of the four channel pairs for monitoring Use a standard optical LIGHTPIPE cable for connections to this input USB CLASS 2 AUDIO INTEFACE USB input for streaming audio to and from a host computer Use a standard USB type A to type B cable included with your m905 The type A connector is
48. itoring level in 0 5dB steps When the standard 5 clock status this area displays the main clock level display mode is active configured in SETUP the ing functions and status of the m905 s DAC Top row range is 0 100 When reference level display mode displays the selected digital input source S MUX is configured the display range is user defined See if enabled and de emphasis if enabled Second Speaker SETUP for more information Level numbers row displays the DAC s operating sampling rate and highlight green when selected and are adjustable via s Lock status if active Third row displays the selected the volume encoder clocksource and selected clocksource lock status SPL meter this area shows the current SPL level me Fourth row displays the bitstream status pro cons for tering mode and peak level Setup menu allows user TOSLINK S PDIF AND AES S MUX for ADAT and de to select between A and C weighting fast and slow emphasis for TOSLINK S PDIF AND AES 6 Unpacking and installing i YOUR m905 BOX WILL CONTAIN The Audio Control Unit ACU The Remote Control Unit RCU The RCU tilt base and accompanying hardware premounted to the RCU 25 serial cable to connect the and ACU 6 AC power cable which connects to the universal power supply A bag with rubber feet and rack screws The owner s manual and warranty registration i OPEN AND INSPECT THE BOX Please take care when removing the m905 from its
49. ker press and hold recalls volume preset On headphones if level is 0 0 push and hold recalls headphone preset If head phones are on press and hold toggles headphone mute Talkback activates the talkback microphone either built in or external DB15 serial connector connects RCU to ACU with sup plied 15 pin serial cable 1 4 TRS headphone jack wired in parallel to head phone jack on frontpanel of ACU USB upgrade port for future RCU firmware revisions B m905 GRAPHICAL USER INTERFACE unbaanced balanced 1 cue tosin 4 Genelecs sub Headphones x feed 4 spl dBA L 7 9 clk usb locked peak 90 2 Ea 5 Input buttons these 2 rows at the top and the bottom mode Resetting peak level is done by pushing and of the screen represent the available system inputs holding the MON gt CUE hardware switch Each button directly corresponds to its particular 4 Headphone level and x feed status this area shows input select switch and its corresponding input source the current headphone monitoring level 0 100dB Custom labeling is available via the setup menu Active 5dB steps and cross feed status push and hold DIM input button is a friendly shade of blue hardware switch to activate deactivate crosssfeed Main speaker level and speaker set this area shows Level numbers highlight green when selected and are the current speaker set selected and the current adjustable via the volume encoder mon
50. lls the last saved configuration The following parameters are saved as part of the user configuration INPUT SELECT SPEAKER SELECT SELECTED INPUT PAIR DAC SOURCE LAST SELECTED AES INPUT MON gt CUE STATUS CROSS FEED STATUS B ENTERING AND EXITING SETUP MODE Pushing the setup button enters the m905 into setup mode This is indicated by the display showing the m905 setup mode screen and the setup button flashing white In this mode the user can configure all of the adjustable system parameters while still having access to most of the normal mode features unbalanced balanced toslink Press and release SETUP button to exit and save Press and hold SETUP button to exit without saving Press and hold ENCODER knob for headphone setup Press MONO button to scroll through system setup s pdif lt figure Setup Screen gt From this screen pushing any hardware switch will enter that features individual setup menu From here rotating the knob clockwise moves the white highlighted selection down Rotating it counter clockwise moves the white highlighted selection up In some cases there may be more parameters than can be displayed at one time on the screen If this is the case the display indicates this by placing a little up or down arrow on the right edge of the display unbalanced balanced CUE toslink AES SETUP SPL dBA 47 4 input name aes level offset 0 0dB clocksource AES s lock enabled
51. n very well by stripping embedded clock data from a connected digital audio source However you may have your entire digital audio system referenced from a single master clock hence the ability for the m905 to receive and lock itself to this clock WORDCLOCK OUT The Word Clock output allows the user to synchronize other digital audio equipment to the m905 It functions in two modes When monitoring a digital input with the clock source set to word clock the word clock output will be a buffered copy of the word clock input If the input being monitored is not set to have word clock as the clock source then the word clock output will be the clock recovered from the the incoming digital audio data stream In the case of USB the word clock output will be derived from the m905 internal clock The output is buffered and is designed to drive a 75 Ohm line WORD CLOCK LOAD SWITCH The switch labeled 1M Ohm 75 Ohm is used to terminate the Word Clock input If the Word Clock signal in your studio is being daisy chained from unit to unit including the m905 you ll want to set the switch to 1M Ohm which is essentially an unloaded setting If the m905 is the only device being clock referenced or the last unit in a daisy chain of other high impedance units you ll want to select the 75 Ohm load position for proper termination NOTE Selecting the 75 Ohm load position when there is already another device on the line that has a 75 Ohm load will create a total
52. ndicated on the headphone status display X feed cross feed simulates the acoustics of a loudspeaker listening environment which can significantly improve imaging while reducing listening fatigue when using headphones This feature employs carefully designed signal cross feed filtering and delay circuits to simulate hrtf head related transfer functions PRESS AND RELEASE BUTTON Toggles the speaker DIM function on and off PRESS AND HOLD BUTTON Toggles the headphone x feed mode on and off L R The multi function MONO 1 8 button controls the MONO and the LEFT minus RIGHT features MONO sums the left and right channels and provides this signal to both the left and right channels of the speaker and sub outputs if stereo sub is configured The headphone output also becomes MONO if the headphone mono control is enabled configured in SETUP When speaker headphone MONO is active the switch is lit solid yellow L R subtracts the right channel from the left channel and provides this signal to both the left and right channels of the speaker sub if assigned and headphone outputs When L R is active the button flashes yellow PRESS AND RELEASE BUTTON Toggles the speaker headphone MONO if L R is disabled Headphone MONO be disabled in SETUP Disables L R if L R mode was active PRESS AND HOLD BUTTON Toggles the L R monitor mode on and off MON gt CUE SPL CLEAR The multi function MO
53. o balanced Speaker 2 output stereo balanced Speaker 3 output stereo balanced Cue input for studio headphone mixes sums with talkback mic signal for CUE output Analog Balanced Input via XLR connectors Analog Unbalanced input via RCA connectors External Talkback mic input for any type of external microphone 7 70dB gain 48V configurable in the setup menu AC mains power standby switch green when m905 system is powered on ALL SYSTEMS GO 3 REMOTE CONTROL UNIT RCU 5 10 Cunbsianced Balanced cue tosi 5 sub 4 Headphones x feed 59 0 dac usb rate 96 0kHz clk usb locked spl dBA peak 90 2 7 9 bits n a ier SPEAKER I 11 MUTE solo 12 13 1415 16 0 SUB MUT SETUP sub solo MON gt spl clear TALKBACK MONO L R VOLUME push for phones 01 11 19 Note for all the dual function buttons on the RCU the primary push release function illuminates solid and the push and hold function flashes 1 Graphical user interface GUI This color LCD displays all operating parameters and setup menus 2 Analog input unbalanced selects input source con nected to the unbalanced RCA analog input 3 Analog input balanced selects input source connected to the balanced XLR analog input 4 CUEinput selects input source connected to
54. or source Internal jumpers can be configured to feed the headphone output with the CUE signal post talkback summing This allows the m905 headphone amplifier to be used as a headphone monitor ing system for the studio To listen to input sources other than the CUE input pres the MON gt CUE button To configure the headphone source move jumpers JP1 and JP2 on the main pcb inside the m905 see m905 MAIN PCB Jumper Locations page 36 Disconnect the m905 from its AC power by unplugging the AC power cable Use a 2 Phillips screw driver to remove the top cover from the m905 There are 8 screws to remove on the top cover 4 on the top and 2 on each side Be careful to discharge any static electricity on the outside of the chassis before touching any of the jumpers inside the m905 B TALKBACK SETUP From the setup screen pressing the talkback button enters talkback setup mode Once talkback setup mode is active pressing the talkback button will have the same function as it does in normal mode The m905 features a flexible talkback system for communicating with the performers Two different talkback sources are available 1 Built in mic on the RCU and 2 external mic input on the ACU Each of these have independent controls and setup When talkback is active the talkback signal is summed into the cue output In addition a dedicated balanced analog talkback output is available on the ACU that allows the talkback signal to be routed to other system
55. oray OS 66000000000000000 583 0858805009 99990000000000000 X 72220 GRACE DESIGN Ra O 6 50 m905 DIGITAL I O PCB JUMPER LOCATION P165 Rev A aries REV Wiring Diagrams DB15 15 pin RCU connector Connector back side veiw Both cable ends are identical TX 5VDC GPIO TALKBACK BLACK O HEADPHONE LEFT YELLOW HEADPHONE GND RX TX 6 5VDC 3 3VDC TALKBACK GND HEADPHONE RIGHT Do not use an off the shelf DB15 cable as the pinout will be incompatable If you need a longer cable contact your Grace Design dealer or us directly Talkback remote switch diagram SHIELD TALKBACK CONTROL TIP 1 4 TRS PLUG To m905 Remote Talkback Jack Normally open switch Balanced XLR output to unbalanced 1 4 input Balanced Output XLR Unbalanced 1 4 gt SHIELD 37 Your m905 system chassis is constructed out of high quality anodized T6 aluminium Under normal circumstances virtually no maintenance is required to keep the unit looking shiny and new However if you unit becomes smudged or dirty here are some cleaning tips Apply windex to a clean lint free cloth and gently wipe all surfaces taking care not to allow the cleaning product to build up around any panel switches or knobs Grace Design warrants all of our products to be free of defective parts and workmanship for a period of five years This warranty period begins a
56. r S MUX of an ADAT format digital source 9 USB Class 2 interface provides an asynchronous mode computer interface PCM up to 24bit 196kHz and DSD64 and DSD128 via DoP V1 1 Configured for two channels down from computer and 10 channels up to computer 10 i AUDIO CONTROL UNIT FRONT PANEL Digital out provides a buffered digital loop through of m9os5 REFERENCE MONITOR CONTROLLER GRACE DESIGN USA 1 HEADPHONE OUTPUT standard TRS 1 4 jack head phones Wired in parallel with the jack on the RCU Connection to headphones should be made using standard TRS stereo connectors S PDIF TOSLINK ADAT SPEAKER 2 11 12 13 14 15 16 17 18 19 20 21 22 23 2 10 11 A USB 2 gt SPEAKER 3 19 20 21 a selected source via AES or S PDIF Multi mode SUB DAC Meter output can be used as either a subwoofer output mono or stereo a fixed level DAC output or a dedicated meter output Con figurable in the setup menu Cue out stereo output includes sum of the CUE input signal with talkback mic signal Talkback output mono output of talkback microphone signal USB upgrade port for future ACU firmware revisions DB15 Remote connector connects the m905 ACU and RCU with supplied 15 pin serial remote cable Talkback switch input momentary or latching opera tion configured in the setup menu Speaker 1 output stereo balanced Speaker 1 output stere
57. rent but you will remember how to do this from getting the high score on asteroids Pressing the encoder once brings up the character cursor From here rotate the knob to position the cur sor under the character you wish to edit Press the encoder again to enter edit Rotate the knob until the desired character is displayed Press the encoder again to enter the desired character and get back to the cursor Once all of the desired changes are complete move the cursor back to the and press the encoder to initiate the name change unbalanced balanced cue toslink AES SETUP SPL dBA 47 2 input name lt 6 es level offset 0 0dB unbalanced balanced cue toslink AES SETUP SPL dBA 47 4 input name aes level offset clocksource A SI clocksource AES s lock enabled s lock enabled demphasis off demphasis off adat s pdif adat s pdif lt figure editing the input name gt If the setup mode is changed or exited prior to selecting the lt any modifications to the name will be ignored LEVEL OFFSET The volume level of each input can be matched by adjusting the level offset on each input When an input is selected this offset is added to the to all the signal paths using this input The input level offset range is 20dB in 0 5dB steps This setting allows for precise matching of loud nes between various input sources CLOCKSOURCE The clocksource can be independently selected for
58. represents the reference level that is displayed when display mode reference level at the current volume setting Available range is the current volume setting 100 in 0 5 steps This parameter is the same for all speaker outputs 18 The following is an example of how the reference level may be configured for an 82dBSPL reference listening level Play and monitor a nominal level noise source Adjust the speaker level until the SPL measurement at the listening position equals 82dBSPL Enter SETUP and navigate to the REF LEVEL GLOBAL parameter and adjust it to 82 Navigate to the DISPLAY MODE GLOBAL and set the parameter to reference level Exit SETUP The speaker level will now display 82 0 to correlate with the reference level An increase or decrease in the volume setting now corresponds to the listening SPL given a nominal input signal At anytime the display mode can be adjusted or changed back to the standard level 0 100 display in SETUP Available setup parameters for each speaker output Default values are in parenthesis SPEAKER 1 speaker name speaker 1 level offset 0dB balance center sub output L R Stereo sub offset 008 preset level global 0 0 display mode global standard level reference level global 0 0 SPEAKER 2 speaker name speaker 2 level offset 098 balance center sub output L R Stereo sub offset 008 preset level global 0 0 display mode global standard level reference l
59. s Talkback setup parameters are as follows RCU MIC GAIN This parameter sets the gain of the internal RCU talkback mic The available range is OdB to 63dB 1dB steps The default is OdB EXT MIC GAIN This parameter sets the gain of the external ACU talkback mic The available range is 15dB to 70dB in steps with one gain setting of 7dB The default is 7dB EXT MIC PHANTOM POWER This parameter controls the 48V phantom power for the external ACU talk back mic This should only be turned on when using an external microphone that requires 48V phantom power The available settings are off and 48V The default is off TALKBACK ENABLE This parameter controls the different talkback modes Available options are as follows rcu or ext mic In this mode the RCU talkback button enables the RCU talkback mic and the remote talkback switch on the ACU enables the external talkback mic rcu mic only In this mode either the RCU talkback button or the remote talkback switch on the ACU enables the RCU talkback mic ext mic only In this mode either the RCU talkback button or the remote talkback switch on the ACU enables the external ACU talkback mic The default is rcu or ext mic CONTROL MODE This parameter configures how the RCU talkback button and the remote talkback switch on the ACU operate Available options are as follows momentary talkback is enabled only when the switch is pressed and held closed
60. sables speaker headphone solo if solo mode was active PRESS AND HOLD BUTTON Enables the solo mode if solo mode was inactive The last used solo mode left or right is activated upon entering solo mode Toggles the left right channel solo mode if solo mode is already active SUB MUTE sub solo The multi function SUB MUTE sub solo button controls the sub mute and sub solo features NOTE These features are only available when the SUB DAC METER is configured for sub output mode in SETUP SUB MUTE mode mutes the signal going to the sub output if assigned When the SUB MUTE is active the switch is lit solid red 12 Sub solo mode provides a means to monitor the sub output program material exclusively In Sub solo mode the speaker output is muted and only the sub output is on When Sub solo mode is active the button flashes red PRESS AND RELEASE BUTTON Toggles the sub output mute on and off if sub solo is disabled Disables sub solo if sub solo mode was active PRESS AND HOLD BUTTON Toggles sub solo mode on and off DIM x feed The multi function DIM x feed button controls the speaker DIM and headphone x feed features Speaker DIM attenuates the speaker and sub if assigned by the preset attenuation level configured in SETUP When speaker dim is active the switch is lit solid yellow Headphone x feed engages the cross feed circuit in the headphone output When x feed is active it is i
61. ss device with the name 1905 ACU coe General options using Dropbox 54 Import pictures and videos J using Windows Explorer View more AutoPlay options in Control Panel Open the folder It will contain a single file named READY TXT This indicates that m905 ACU is now ready for the firmware update Simply locate the firmware file that was downloaded filename starts with 1905 ACU drag and drop the file to the folder containing READY TXT lt gt Computer m905 ACU Burn Share with Organize v New folder z Favorites 3 Name Date modified Type Size Desktop a Ready txt 8 17 2012 4 31 PM Text Documen t 1KB B Downloads 1 Dropbox 2 Recent Places Documents 30 Oncethe file appears in the folder it has been copied and the m905 ACU begins updating its flash memory DO NOT DISCONNECT THE DEVICE OR INTERRUPT POWER TO THE m905 WHILE THIS IS IN PROCESS the reprogramming is complete the m905 RCU will disconnect reconnect itself from the computer Open the folder again The file named SUCCESS TXT should be in the folder This is your indication that the firmware update process has completed successfully If the m905 ACU encounters any prob lems during the USB upgrade process the folder will contain a file named ERROR TXT The type of problem encountered is reported on the Status line in
62. t the last selected digital input is converted and sent to this output at all times Typically this output is used to utilize the high performance m905 DAC when connected to an analog mastering deck or other analog outboard gear The meter output can be configured at a fixed level or to follow the speaker monitoring level Connections are made with standard balanced XLR cables Connectors are wired pin 1 shield pin 2 positive pin 3 negative STEREO HEADPHONE OUTPUTS HEADPHONE outputs are provided via 4 TRS Tip Ring Sleeve jacks one on the frontpanel of the ACU and the other on the RCU These outputs are wired in parallel The head phone output amplifier is capable of delivering very high currents to the headphones and can drive loads down to 25 Ohms DIGITAL OUTPUTS 53 S PDIF Two stereo digital loop thru outputs are provided via AES3 XLR and S PDIF RCA connectors These provide a buffered output of a user selectable digital input Use of high qual ity 110 Ohm balanced cable for the AES3 out 75 Ohm cable for the S PDIF out is highly recommended WORDCLOCK IN The m905 can accept a Word Clock signal from an external clock generating unit via this BNC connector This might be a stand alone clock source or via for example the Word Clock output from your digital audio workstation It should be noted that referencing the m905 from an external Word Clock is not necessary for the unit to function properly as the m905 will also functio
63. t the original date of purchase and is transferable to any person who may subsequently purchase the product during this time This warranty excludes the following conditions normal wear and tear misuse customer negligence ac cidental damage unauthorized repair or modification cosmetic damage and damage incurred during shipment During the time of this warranty Grace Design will repair or replace at its option any defective parts or repair defective workmanship without charge provided the customer has appropriate proof of purchase and that the product has its original factory serial number e Customers within the US are responsible for all inbound freight charges to Grace Designs facility while Grace Design will pay for return freight charges via ground service Customers outside the US must contact their distributor for warranty product return details In order for Grace Design to provide efficient and timely warranty service it is important that you mail the completed warranty registration card enclosed with all of our products within 10 days of the original date of purchase You may also register your product directly with Grace Design by telephone 303 823 8100 Monday Friday 9 00am to 5 00pm MST or you can register your product online at www gracedesign com This warranty is in lieu of all other warranties whether written expressed or implied INCLUDING ANY WAR RANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOS
64. the bal anced XLR CUE input 5 TOSLINK input selects input source connected to the TOSLINK optical input 6 ADAT AES DW INPUT When mode is active se lects ADAT format digital stereo signal Once selected pushing the switch toggles through available input pairs When AES Dual Wire mode is active AES DW selects the Dual Wire source connected to the 51 and AES2 inputs 7 S PDIF selects input source connected to the S PDIF RCA style connector 8 AES selects the last used AES source Once selected pushing the switch toggles between AES1 and AES2 9 USB selects computer input source connected to the USB connector 10 Speakers 1 2 3 illuminated switches select any one pair of the three available speaker outputs 11 Mute solo switch mutes the speakers or press and hold to toggle solo channel 12 13 14 15 16 17 18 19 20 21 Dim x feed reduces the monitoring level by a prescribed amount Press and hold to toggle on off cross feed in headphones Sub mute sub solo button mutes the subwoofer Press and hold solos the subwoofer MONO sums to mono L R the current signal being monitored Press and hold subtracts the right channel from the left channel L R SETUP enters the setup menu MON gt CUE routes currently selected monitor source to the CUE output Press and hold to clear SPL peak level Volume adjusts speaker and headphone levels Push to toggle between either level On spea
65. to loudspeakers in a room your left ear hears sound primarily from the left speaker and vice versa but also receives a signal from the right speaker at a lower level and with some time delay compared to the right ear As well the right speaker sound that reaches the left ear does not have a flat frequency response as the sound waves have traveled around the shape of your head before reaching your left ear The brain uses delay level and frequency response characteristics to process the location of a sound and hence create an aural image When listening through headphones each ear only hears the sound from one transducer and the mixing of signals between the ears does not exist In this situation the brain is left without many of the psycho acoustic clues required to generate a properly distributed image and an accurate sound stage The result is that instruments seem to cluster in the far left far right or center of your head Since the vital clues are absent the brain has a difficult time deciding how to process the sounds coming from the headphone which can result in listening fatigue when listening for extended periods of time The m905 contains circuitry which electronically simulates the signal cross feed that occurs in a real acoustic space and helps the brain establish instrument locations across the entire sound stage While it is difficult to perfectly model the very complex level delay and frequency response characteristics of the head th
66. vel see below This setting can be useful for utilizing the m905 DAC for digital to analog transfers When meter output is selected this output acts as a dedicated analog meter output The selected monitoring source is either output at a fixed meter level or post fader speaker level see meter mode below The meter output follows speaker output mono L R and solo settings NOTE When solo and mono are active only the mono signal is provided to the active solo channel on the meter output DAC LEVEL OdBFS This controls the fixed output level of the DAC output when DAC output mode is se 19 lected above The setting is the equivalent balanced analog output level given a OdB full scale digital input level Available range is 76 0dBu to 24 0dBu in 0 5dB steps The default is 76 0dBu DAC BALANCE The balance of the DAC output can be adjusted The available balance range is 10dB to the left or right in 0 5dB steps When no balance adjustment is present on the DAC output the parameter displays center The default is center METER MODE This selects the type of meter output when the meter mode is selected above Available options are fixed meter level and follow speaker When fixed meter level is selected the output level is controlled by the meter level parameter below When follow speaker is selected the output level follows the speaker volume level including any input offset The default is fixed meter level METER LEVE
67. ynchronous with the ADAT or AES TOSLINK SPDIF source which will result in data corruption on those channels f it is required that the 10 channels to the computer not be interrupted in any way then the m905 must be monitoring the USB without being changed to other digital inputs It is possible to switch the m905 to an analog source since that will not cause a change in clocking in the digital sec tion s LOCK In a situation where a digital input is outside the lock range of the s lock pll it can be helpful to disable the s lock circuit This parameter allows the s lock to be independently disabled for each digital input Available options are enabled and disabled DEMPHASIS The DAC de emphasis filter can be configured independently for each digital input Avail able options are off on and auto When off is selected no de emphasis filtering is applied When on the de emphasis filter is engaged for that input The auto setting uses the de emphasis bit in the digital audio stream to control the de emphasis filter Auto de emphasis is only available on the S PDIF TOSLINK and AES3 inputs When de emphasis is on it is indicated in the top row of the DAC display S MUX The ADAT input supports 88 2 96kHz sample rate S MUX decoding When enabled the available channels switch from 1 8 to 1 4 Available options are off on and auto The auto setting uses the S MUX bit in the ADAT audio stream to control the s mux decoding When S MUX is on

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